<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <div id="app">
        <input type="text" v-model="msg">
        <strong>{{msg}}</strong>
    </div>
</body>
<script src="./js/vue.js"></script>
<script>

  //数据双向绑定
  new Vue({
      el:"#app",
      data:{
          msg:"hello vue"
      }
  });

</script>
</html>